Drawing-pen.



IIMIHNIIF ml 5 v Patented Oct. l5, l90l. W. KEUFFEL. DRAWING PEN.

(No Model.)

Wilma mo L 7 ZM/L/I/Z/ Uwirn STATES ATENT rricn.

IVILHELM KEUFFEL, OF I-IOBOKEN, NEW JERSEY, ASSIGNOR TO THE KEUFFEL &ESSER COMPANY, OF NEW JERSEY.

DRAWING-PEN.

SPECIFICATION forming part of Letters Patent No. 684,437, dated October15, 1901.

Application filed January 18, 1901. Serial No. 43,700. (No model.)

To aZZ whom it may concern.-

Be it known that I, WILHELM KEUFFEL, a citizen of the United States,residing in the city of Hoboken, in the county of Hudson and State ofNew Jersey, have invented a new and useful Improvement in Drawing Pens,of which the following is a specification.

This invention relates to ruling or drawing pens which consist of twoblades adjustable toward or from each other to decrease or increase thedistance from their points or the pressure of the points against eachother in order to make lines of greater or less width or thickness. Insuch pens it is a desideratum that the blades be arranged so that theymay be widely separated from each other for the purposes of inspection,cleaning, and grinding or sharpening and again closed together withoutdisturbing the means whereby the proper adjustment of the blades is attained; and the object of this invention is to provide improved meanswhereby such a result is accomplished.

IVith this object in view the invention consists in the improvedconstruction, arrangement, and combination of parts hereinafter fullydescribed and afterward specifically claimed.

In the accompanying drawings, Figure 1 represents a View in sideelevation, on an enlarged scale, of a pen embodying my improvements, thehandle being omitted and the blades being shown adjusted to position formaking a line. Fig. 2 represents a similar view with the blades open forinspection, cleaning, or sharpening. Fig. 3 represents a view in frontelevation with the parts adjusted as in Fig. 1. Fig. at represents aview in elevation of the adj usting devices arranged in their properrelative positions,but detached from each other. Fig. 5 represents aview similar to Fig. 2, illustrating a slight modification.

Like letters of reference mark the same parts wherever they occur in theseveral figures of the drawings.

In pens of the general class now under consideration the following partsare almost universally provided, to wit: two blades, as at a b in Figs.1, 2, and 3 or at 0', Z) in Fig. 5, which blades are either madeintegral of a single piece of steel, as in Figs. 1, 2, and 3, or onehinged to the other, as at c in Fig. 5, means for normally andyieldingly holding the two blades apart, as the elasticity of the part61 of the blade b in Figs. 1, 2, and 3 or a spring between the bladeswhen hinged, an instance of which is shown at cl in Fig. 5, and finallydevices for moving the blades toward each other against the force ofsuch normal opening means, as by the adjusting bolt or screw 6 and nutf. (Shown in Figs. 1, 2, 3, and 5.) Such opening means and adjustingscrew and nut form no part of my present invention and are simply shownas instances of the ordinary construction of such pens and to assist inthe proper illustration of my invention.

The screw 6 in Figs. 1, 2, and 3 fits slidably in an opening in theblade to, being projected from a fiat bar g, which slidably fits in acorrespondingly-shaped smooth opening in the blade I). The bar 9 ispivotally connected by a pin 72, with a cam-lever 'i, which isbifurcated, its ends j j straddling the end of bar 9 and bearing as camsagainst the outside of blade I). In Fig. 5 the screw 6 is extendedthrough blades a b, and the lever t' is pivoted directly to it at h. Inthe position shown in Fig. 1 these ends j j lie flat upon the outersurface of blade I) and serve as stops to prevent the bar g from beingdrawn through the openings in blades a and b and in the capacity of abolt-head, whereby the turning inward of the nut f on screw 6 will drawthe blade Z2 toward the blade at against the outward pull of the saidblade b due to its spring portion d until the desired adjustment of theblades a and b is reached.

With the hinged blade I), Fig. 5, the spring d, as before stated, takesthe place of the elastic portion cl of blade I) and normally forces theblades 0. b apart in the same manner. When, however, it is desired toopen the blades for the purposes mentioned, the

again brought together, preserving the original adjustment.

The advantages attending the use of this invention Will be obvious tothose skilled in art, and it will further be obvious that slight changesmay be made in the construction of the various parts Without departingfrom the spirit and scope of my invention.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent of the United States, is-

1. The combination with a ruling or drawing pen having a fixed and amovable blade of a bolt slidably fitted in openings through both blades,a lever having bifurcated cam ends straddling and pivoted to one end ofthe bolt, and separate and independent adj usting means at the oppositeend of the bolt, substantially as described. V

2. The combination with a ruling or drawingpen having afixed and amovable blade, of abolt slidably fitted in openings through both blades,a nut at one end of the bolt, and a lever having bifurcated cam endsstraddling and pivoted to the other end of the bolt, substantially asdescribed.

3. The combination in a ruling or drawing pen of two blades normally andyieldingly' pressed apart,a bolt slidably fitted in registering openingsin the two blades and projecting beyond the outer faces of both blades,a nut threaded on one of the projecting ends of the 7 WILHELM KEUFEEL.

\Vitnesses:

HERMAN MEYER, MABEL K. WVHITMAN.

